Yep, top end rubbish talk is just that, top end rubbish talk, it's like the reason (normally) 400's kick 250's round the park is not power, it's flexability, everyone who's rode a decent 250 will tell you it should kill a 400 but no one without Dani Pedrosa type skills can exploit that last 5%. Multiple gear changes in corners and dropping out of the power are where time is lost. My 400 makes 80% of it's peak torque (which is more than the average NSR ever makes) at 5000 rpm!

However I'm not talking about just losing power below 8000 by removing the air filter, I picked up 2 bhp at peak but lost everywhere below 10500 rpm, if you keep an NSR reving that high all the time, all power to ya.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread